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main.go
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main.go
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package main
import (
"fmt"
"log"
"math"
"math/rand"
"net/http"
"github.com/gorilla/websocket"
"github.com/joshdstockdale/go-truck-tracker/types"
)
func main() {
// Produce messages to topic (asynchronously)
recv, err := NewDataReceiver()
if err != nil {
log.Fatal(err)
}
http.HandleFunc("/ws", recv.handleWS)
http.ListenAndServe(":30000", nil)
}
type DataReceiver struct {
msgchan chan types.OBUData
conn *websocket.Conn
prod DataProducer
}
func NewDataReceiver() (*DataReceiver, error) {
var (
p DataProducer
err error
topic = "obudata"
)
p, err = NewKafkaProducer(topic)
if err != nil {
return nil, err
}
p = NewLogMiddleware(p)
return &DataReceiver{
msgchan: make(chan types.OBUData, 128),
prod: p,
}, nil
}
func (dr *DataReceiver) produceData(data types.OBUData) error {
return dr.prod.ProduceData(data)
}
func (dr *DataReceiver) handleWS(w http.ResponseWriter, r *http.Request) {
u := websocket.Upgrader{
ReadBufferSize: 1028,
WriteBufferSize: 1028,
}
conn, err := u.Upgrade(w, r, nil)
if err != nil {
log.Fatal(err)
}
dr.conn = conn
go dr.wsReceiveLoop()
}
func (dr *DataReceiver) wsReceiveLoop() {
fmt.Println("client connected")
for {
var data types.OBUData
if err := dr.conn.ReadJSON(&data); err != nil {
log.Println("read error:", err)
continue
}
data.RequestID = rand.Intn(math.MaxInt)
if err := dr.produceData(data); err != nil {
fmt.Println("kafka produce error:", err)
}
}
}